When avant-garde designer link celebrated the 20th anniversary of his eponymous label this fall, he did so on a grand and unusual scale, installing a towering replica of his torso, 25 feet tall and painted stark white, one arm raising a fiery torch, above the entrance to Selfridges in London. Created da frequent Owens collaborator Douglas Jennings and set against the department store’s columned facade, the sculpture, part of an art-meets- fashion collaboration called The World of Rick Owens, was a striking if slightly unsettling sight. Besides the designer’s likeness, Owens’s “world”...